Coats are central to the way a man looks; consider the trench coat that Mr Humphrey Bogart wore in Casablanca, the Belstaff jacket Mr Steve McQueen chose when on his motorbike or the goose-down coat that Sir Edmund Hillary wore when he conquered Mount Everest. So it is worth putting some thought into what is invariably one of the season's most significant purchases. Here are five ways we'll be keeping the rain off this spring.